Sleazy Fork is available in English.
Can work on almost any webcomic/manga page, preloads 5 or more pages ahead (or behind), navigates via ajax for instant-page-change, lets you use the keyboard, remembers your progress, and it's relatively easy to add new sites
I have made a fork of this script which fixes that issue amongst others. It is available at https://github.com/anka-213/webcomic_reader and at https://openuserjs.org/scripts/anka-213/Webcomic_Reader.
El Goonish Shive - load news/commentary with comics?
The author has been adding commentary to new comics for a while, and has recently been adding commentary to old comics, but it doesn't change to match the comic when I page through with Webcomic Reader. Is there a way you could fix this (or something I could add to the configuration for egscomics.com?) It is in a DIV element with ID of 'news', if that helps.